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- PDC interrupt controller
- Qualcomm Technologies Inc. SoCs based on the RPM Hardened architecture have a
- Power Domain Controller (PDC) that is on always-on domain. In addition to
- providing power control for the power domains, the hardware also has an
- interrupt controller that can be used to help detect edge low interrupts as
- well detect interrupts when the GIC is non-operational.
- GIC is parent interrupt controller at the highest level. Platform interrupt
- controller PDC is next in hierarchy, followed by others. Drivers requiring
- wakeup capabilities of their device interrupts routed through the PDC, must
- specify PDC as their interrupt controller and request the PDC port associated
- with the GIC interrupt. See example below.
- Properties:
- - compatible:
- Usage: required
- Value type: <string>
- Definition: Should contain "qcom,<soc>-pdc"
- - "qcom,sdm845-pdc": For SDM845
- - reg:
- Usage: required
- Value type: <prop-encoded-array>
- Definition: Specifies the base physical address for PDC hardware.
- - interrupt-cells:
- Usage: required
- Value type: <u32>
- Definition: Specifies the number of cells needed to encode an interrupt
- source.
- Must be 2.
- The first element of the tuple is the PDC pin for the
- interrupt.
- The second element is the trigger type.
- - interrupt-controller:
- Usage: required
- Value type: <bool>
- Definition: Identifies the node as an interrupt controller.
- - qcom,pdc-ranges:
- Usage: required
- Value type: <u32 array>
- Definition: Specifies the PDC pin offset and the number of PDC ports.
- The tuples indicates the valid mapping of valid PDC ports
- and their hwirq mapping.
- The first element of the tuple is the starting PDC port.
- The second element is the GIC hwirq number for the PDC port.
- The third element is the number of interrupts in sequence.
- Example:
- pdc: interrupt-controller@b220000 {
- compatible = "qcom,sdm845-pdc";
- reg = <0xb220000 0x30000>;
- qcom,pdc-ranges = <0 512 94>, <94 641 15>, <115 662 7>;
- #interrupt-cells = <2>;
- interrupt-parent = <&intc>;
- interrupt-controller;
- };
- DT binding of a device that wants to use the GIC SPI 514 as a wakeup
- interrupt, must do -
- wake-device {
- interrupts-extended = <&pdc 2 IRQ_TYPE_LEVEL_HIGH>;
- };
- In this case interrupt 514 would be mapped to port 2 on the PDC as defined by
- the qcom,pdc-ranges property.
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